If you thought summer was beginning to wind down, think again as triple-digit temperatures have returned to Northern California with some record-breaking possibilities.

The weekend was pretty warm in most spots around the region, but Monday will be the start of some hot temperatures.

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Sacramento started the day at 65 degrees and is expected to heat up to 109 degrees, likely breaking the old record for Aug. 28, which was 105 degrees set back in 2008, according to the KCRA 3 Weather team.

Stockton and Modesto are also on track to break records, with Stockton projected to hit 108 degrees, beating out the old record set in 1981 of 106 degrees, and Modesto could get to 109 degrees, surpassing the 2015 record high of 105 degrees.

Along with the heat, the air quality is not looking good: Levels in Sacramento and Stanislaus counties are predicted to be unhealthy for sensitive groups. Plan to avoid being outside and engaging in strenuous activities between the peak heating times of 2 p.m. and 6 p.m.

National Weather Service, Sacramento

The National Weather Service has issued an excessive heat warning Monday for much of the Sacramento Valley.

Here's where temperatures are forecast to be across Northern California: